To your list I would add "profile reduction" -- bevelling or rounding surfaces that have a tendency to grab on to things when you draw. Back of the slide, the hammer, the spur, the front site (that's one that gets ignored till they whack it off on a brick wall during a chase and suddenly don't remember how to aim without a front sight.). Obviously, in the field, you have to be able to replace broken parts, so you want to stay standard as possible. They're not going to send your mercury filled recoil reducer in the mail to iraq if you lose one.
But spec ops guys are special. They get to take their OWN sidearms on trips
And before they go, they load em up with a wide assortment of goofy shit that is basically for pimpin dey gun.j
The old schoolers snarl at them of course, but i always enjoyed talking to both camps.